| 摘要 | 第1-5页 |
| ABSTRACT | 第5-7页 |
| Abbreviations Used | 第7-8页 |
| 1 Introduction | 第8-13页 |
| ·Progress of enclosure method | 第8-12页 |
| ·Objectives of the study | 第12-13页 |
| 2 General Situation of Study Area | 第13-19页 |
| ·Natural geographical conditions | 第13-17页 |
| ·Topography and geomorphology | 第13-14页 |
| ·Climate | 第14-15页 |
| ·Soil | 第15-16页 |
| ·Vegetation | 第16-17页 |
| ·Yanchi County social economy condition | 第17-19页 |
| ·Population | 第18页 |
| ·The present situation of grassland utilization | 第18-19页 |
| 3 Study Method | 第19-24页 |
| ·Data collection method | 第19页 |
| ·Soil sampling | 第19-20页 |
| ·Data managements methods | 第20-24页 |
| ·Plant community characteristics dynamic in Yanchi County | 第22页 |
| ·Soil crust measurement | 第22-24页 |
| 4 Result and Analyze | 第24-63页 |
| ·Comparative analysis of quantitative characteristics of plant community | 第24-44页 |
| ·Natural grassland plant community quantitative characteristic changes | 第24-26页 |
| ·Quicksand vegetation community quantitative characteristics | 第26-27页 |
| ·Quantitative characteristic of artificial fencing | 第27-32页 |
| ·The plant community quantitative characteristics of abandoned land | 第32-34页 |
| ·Dynamic analysis of plant community structure and characteristics | 第34-37页 |
| ·The plant community structure characteristics of quicksand | 第37-38页 |
| ·Artificial fencing of grass land community structure characteristics | 第38-42页 |
| ·The plant community structure characteristics of abandon grassland | 第42-44页 |
| ·Plant community structure characteristics dynamic analysis | 第44-50页 |
| ·Cross analysis of precipitation and vegetation restoration | 第50-54页 |
| ·The Biological soil crust analysis | 第54-55页 |
| ·Summary of the results and the concepts discovered frame | 第55-57页 |
| ·Discussion | 第57-63页 |
| 5 Conclusion and Suggestion | 第63-65页 |
| References | 第65-70页 |
| ACKNOWLEDGEMENTS | 第70-71页 |
| 个人简介 | 第71-73页 |
| 导师简介 | 第73-78页 |
| ANNEX1 | 第78-118页 |
| 1-GENERAL INFORMATION ON DESERTIFICATION | 第78-90页 |
| 2-National Action Plan to combat desertification in China | 第90-92页 |
| 3-Desertification monitoring | 第92-102页 |
| 4-Ecological restoration concept | 第102-104页 |
| 5-Progress of the research | 第104-109页 |
| 6-Paper Published: | 第109-118页 |
